I bought a vehicle with the oxygen sensor only
having 2 lead heads, and it does not have any extra
wire or 'lead head' available for the purpose of illuminating the Malfunction Indicator Light (MIL).
The design of the oxygen sensor is such that it
does not signal the ECU to trigger the MIL to illuminate. Is such a design standard practice by all car
The oxygen sensor is already obsolete from what
I know because most vehicles now are using heated
4 lead head.
Without the engine system alert, how does the owner know that the O2 sensor is faulty or when the
O2 sensor was out of specs like burnt, over-contaminated or even opened/shorted circuit?
Without this warning light and if the oxygen sensor is faulty, it will
become the single greatest source of excessive emission, and I have to pay
more for fuel consumption. An overly rich fuel mixture will also damage the vehicle's catalytic converter.
Answer : You know what you are talking about. However, every
manufacturer designs its vehicle in its own particular way.
It does not mean that the O2 sensor in your vehicle has only 2
leads, that the wrong component has been fitted. If the O2 sensor is malfunctioning and the indicator
light is not coming on, you should get the service people to get that
rectified. It may be a harness or even an ECU problem, which only they with
their test equipment would be in the best position to identify. In the
first place you will need to confirm that the sensor is
actually malfunctioning and to do so would mean having access to the service and test data of the manufacturer.
I agree that a faulty O2 sensor can result in poor
fuel consumption, high emissions, etc. and I am sure
the vehicle manufacturer would be fully aware of this
just by putting the vehicle on the emissions test rig and
connecting up the ECU tester.
After having worked most of my life with a major vehicle manufacturer, I
can say for a fact that if a defect is found, they will leave no stones
unturned until a solution is found and all the problem vehicles rectified.
In this modern age, no one in his right mind can
sweep any technical problem under the carpet, so to
speak, because at the stroke of a keyboard, the whole
world can be made aware of the problem, with
incalculable damage to reputations. Please update us if
you have a problem with the rectification.